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黄色明度最高，()明度最低。

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劳动保障信息网络的主要功能？

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有一水垢在验算中不溶解，加热后缓慢溶解，有透明砂粒沉淀物，加入1%HF可有效溶解，其为()垢

A. 氧化镁
B. 硫酸盐
C. 碳酸盐
D. 硅酸盐

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操作记录应包括以下内容()。

A. 进出压力管道的介质的温度、压力、流量等
B. 介质的反应原理
C. 制定工艺流程的依据
D. 定期检验的质量

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When a vessel navigates in an area with a small underkeel clearance but with adequate space to take avoiding action she ().

A. Should not be regarded as a vessel constrained by her draught
B. Should be regarded as a vessel constrained by her draught
C. Shall be regarded as a vessel restricted in her ability to maneuver
D. Should be regarded as a non-displacement vessel

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